DE2159336A1 - CUTTER - Google Patents

Description

DR.-ING. G. RIEBlJNG PATENT ADVOCATE My sign

D28l-14 / Io / Wm

Please repeat in the answer

899 Lindau (Lake Constance)

Your message from Rennerle 10 ■ P.O. Box 3160

November 26, 1971

Dijet Kogyo Kabushiki Kaisha
(Dijet Industrial Co., Ltd.)
No. 3, Kamisuwayama-cho, Higashisumiyoshi-ku, Osaka / Japan

Milling cutter

The present invention relates to a milling cutter for gear milling of workpieces, in particular a milling cutter capable of performing gear milling of high precision continuously and once has to be used insert tips which can be easily replaced.

Telegraph office hours: Bank accounts: Postal check account:

054374 by appointment Bqyer. State bank lindau (B) No. 1562 Munich 29525

Bayer. Mortgage and Exchange Bank Lindau (B) No. 278920

209828/0857

Gear hobbing hobs are generally complex in shape and have numerous cutting edges on their scope.

Conventional hob cutters that have numerous cutting edges formed directly on the circumference of the cutter body, are widely used in general. However, these hobs are basically uneconomical because they are necessary is to replace the entire hob when its cutting edges are damaged or worn.

These massive hobs, which are mostly made of high-speed steel, also have poor heatability and significant wear and tear after use. Consequently, the winding flutes of the Cutting edges of the hob after each milling operation be sharpened, and besides, the sharpening of the same requires great skill as well a lot of time, because it has to be carried out very precisely.

In addition, the hob cutters made from high-speed steel have a disadvantage in themselves that their cutting edge during gear milling

0 9820/0557

speed are very limited and have to accept an excessively large advance in order to achieve performance to increase. As a result, the tooth shape of the workpieces to be milled deviates significantly from the real one involute curve resulting in rough machined surfaces.

It is therefore to make up for such above disadvantages absolutely necessary to carry out finish machining by gear grinding, with precise regrinding in addition is required, which are, after all, very cumbersome operations.

On the other hand, a composite hob is called uses an improved type of conventional hob, in which the cutter body is equipped with cutting blades manufactured separately from it, what by the possible Replacing the cutting blades alone seeks to achieve an economic effect.

However, since these blades are a body of built-in numerous cutting edges formed in a lateral row are, the leaves themselves are of quite large size and much more complicated in shape, which makes it "It becomes very difficult to re-sharpen them when they are worn out

-A-

? 0 9 8 2 B / 0 BS?

are just like in the case of the massive hob.

Furthermore, it is actually impossible to replace the use of these compound hobs just by replacing them of their cutting blades because their main bodies will also prove to be quite worn out when the cutting blades become unusable after repeated regrinding.

Attempts have been made to improve the efficiency of gear milling by sintering the milling material, but as in the difficulty of regrinding, Not to mention relief grinding to the exact tooth shape, are due to the difficulty of grinding metal carbides Metal carbide hobs have not previously been used, with the exception of micron hobs.

The object of the present invention is therefore to make the above-mentioned disadvantages more conventional To switch off hob cutters completely and to provide a cutter which is very economical can be used by replacing its insert tips alone, which are separate from the cutter body are manufactured and fitted to it.

Another object of this invention is to provide such insert tips of suitable shape for To provide metal carbides which are capable of reversing the same from top to bottom and inside to to be used outside, thereby increasing the number of their uses as well as their usefulness to improve what is worth the cost of expensive materials such as metal carbides.

Another object of this invention is to provide a milling cutter which has a very large insert tip can be easily and quickly manufactured, fitted and replaced.

Another object of this invention is to develop a milling cutter in which the cutter body has a number of fixing arrangements on its circumference, which are attached at fixed intervals in a circumferential direction are to be fastened simultaneously to each fixing assembly by means of a pair of jigs allow a number of tips to be picked up easily and accurately, thereby making it possible to perform gear milling high precision without causing a curvature in the tooth shapes to be milled.

? π ·; ? {/ ■) / η SFi 7

Yet another object of this invention is to develop a milling cutter in which one of a number of tips by means of a wedge and a Clamping screw can be tightened and fastened at the same time, causing the tip fastening part will not come off and the tip holder will be damaged as little as possible.

The above-mentioned objects can be achieved by improving the combination and handling of each component of the The present invention can be achieved and the embodiment thereof will be understood from the following detailed description made clearer in connection with the accompanying drawings.

According to the present invention, the milling cutter is constructed in such a way that the peripheral surface of its milling cutter body has a number of insert tips secured thereon so as to be releasable for easy replacement by means of a number of locating assemblies, wedges and clamping screws, the insert tips of of the single-use type and capable of inside-out and top-to-bottom use to be turned over, and are also able to be securely fastened in the correct position.

- 7 2 0 9 3 <. ' 3/0557

The present invention is embodied in both a typical embodiment and an improved one Embodiment described in detail in conjunction with the accompanying drawings.

It shows:

Fig. 1 is a partially sectioned and partially disassembled Side view of the typical hob assembly according to the present invention;

Fig. 2 is a front view of the hob assembly in substantially along line 2-2 of Figure 1;

3 shows an enlarged front view of the insert tip of the single-use ARt;

FIG. 4 is an enlarged side view of the insert tip taken substantially along line 4-4 of FIG. 3;

FIG. 5 is an enlarged plan view of the insert tip taken substantially along line 5-5 of FIG. 3;

6 shows an enlarged front view of the partially broken off fixing arrangement;

Figure 7 is a top plan view of the fixation assembly taken substantially along line 7-7 of Figure 6;

Fig. 8 is a front view showing an improved embodiment of the hob assembly according to this invention represents;

Figure 9 is a sectional view taken substantially along the line 9-9 of Figure 8;

Fig.Io a partially broken away enlarged front view an improved fixing arrangement for the improved type shown in FIG Hob assembly is used;

11 shows the fixing arrangement in plan view, essentially along line 11-11 of Fig. Io;

Fig. 12 is a front view showing a typical embodiment Figure 3 illustrates the improved single use tip insert according to the present invention;

Figure 13 is a top plan view taken along line 13-13 of Figure 12;

and
Fig. 14 is a front view of the partially broken and omitted main part of the hob assembly,> the

209828/0557

is equipped with the improved insert tip illustrated in FIG.

As is apparent from Figs. 1 and 2, which illustrate a typical embodiment of the present invention, the cutter body 2o has helical flutes 21 on its periphery and a number of straight flutes 22 which are fixed at fixed intervals parallel with the axis in a circumferential direction , wherein a number of support members 23 in the form of hob teeth zx-yiechen the helical flutes 21 are formed behind jßäer straight flute 22, and countersunk key receptacles 24 and threaded holes 25 in front of each straight flute 22 are formed.

Similar to ordinary helical milling cutter teeth, each of the tip support parts 23 is in the form of a pitch angle o { inclined reversible ice on the pitch circle of the teeth with respect to each straight flute 22 and is also so formed to a negative angle of intersection P, the respectively formed in front of them seats 26 of the Spitsen the dimensions of which are smaller than those of the insert tip 27.

Each of the insert tips 27 is on the cutter body

- Io -

209828/0557

-Ic-

2o attached to by means of a number of fixing arrangements 29, a number of adjusting wedges 31 and Clamping screws 32 to be detachable, the fixing arrangement 29 having a number of support incisions 28 and the adjusting wedges 31 have slopes 3o for tightening the tips; each fixing assembly 29 is like that fitted in the straight chip flutes 22 to face each support cut 28 in the correct position to attach to the base of the tooth of each support part 23 of the cutter body 2o; each insert tip 27, which rests in the seat 26 with its lower part on the support incision 28, is secured with the help of Kle-mm screws 32 clamped with the adjusting wedge 31, which is in the wedge receptacle 24 is attached. Thus, it is intended by repeated use of the cutter body 2o to achieve a locking effect, which is made possible by merely replacing the insert tips 27.

Further, these insert tips 27 are received in an inclined state along each seat 26, which one negative rake angle ß, with adequate clearance for the tip.

- 11 -

209828/0557

- il -

This cutting angle β is more or less variable in relation to the diameter of the milling cutter body 2o, the thickness of the insert tip 27 and the milling machining conditions, but is preferably generally around -6.

As also shown in FIG. 1, the clamping screws 32 both have left-hand threads 34 which are inserted into the adjusting wedge 31 provided left-threaded hole 33 fits, as well as right-hand thread 35, which in the in the cutter body 2o provided right-hand threaded hole 25 fits. However, other screws can be used in it.

The detailed description of the tip 27 follows:

The upper part of each insert tip 27 is in the tip body 36 and the lower part to its clamping side 37 trained. For a basic shape of the same, it is intended that the tip body 36 be in the form of a flat one Form block, which has a profile of the theoretical tooth shape, the cutting angle ß of -6 corresponds to, and to form the clamping side 37 in any shape.

- 12 -

'/ (J UUJU / Ü bb 7

Since these insert tips are usually made of high strength quality materials such as Metal carbides, ceramics and thermite, it is desirable to increase their applicability so that the cost the materials are balanced as much as possible.

Thereafter, these single-use tips actually take on a shape shown in FIGS. 3-5.

As can be seen from FIGS. 3 to 5, the lower part of each tip is designed as a clamping side 37 now turned to a lower point 38, by forming it in the same way, ie that on the upper part of the point formed tip bodies 36, each pedestal 38 being one relative to the upright tip body 36 takes on an inverted shape by 180 ° from top to bottom and thus the tip that can be used once by picking it up of the tip body 36 and the ünterspitze 38 formed in one body on the underside of the Eahnee of the tip will.

In other words, the tip body 36 has two parallel flat surfaces 39, 40, both sides 41 and 42, and a top surface 43, the flat surfaces 39, 40 having a profile of the theoretical tooth shape which corresponds to the cutting angle fh of - 6 ° corresponds. the

- 13 -

209828/0557

The lower tip 38 also has flat surfaces 44, 45 on both sides 46, 47, and a top surface 48.

Further, the flat surfaces 39 and 44 as well 4o or 45 two polygonal surfaces which are attached in parallel in the same plane, the top surface of the tip body 36 and the top surface 48 of the lower tip 38 parallel to each other and vertical to the flat surfaces 39, 40 and 44, 45 are formed.

Furthermore, the insert tip 27 is attached parallel to the hob axis and both sides 41, 42 of the tip body 36 are about the pitch angle "C of the tooth formed obliquely to the flat surfaces 39, 4o, while both sides 46, 47 of the lower tip 38 in one reverse state and in the opposite direction to the sides 41, 42 by a negative slope angle -oC are inclined.

It can thus be clearly seen that Bn of every edge line, both the inside and the outside of the tip 27, cutting edges are formed in the tip body 36, such as 49, 50, 51. on the outside and 52, 53, 54 on the inside, and the same cutting edges 55, 56, 57 or 58, 59, 6o on each side of the lower tip

- 14 209828/0557

When milling work is being carried out from the tip body 36, the lower tip 38 serves as the clamping side, while when milling work is carried out with the lower tip 38 reversed, the tip body 36 is the clamping side serves. Som ^ t both the tip body 36 and the lower tip 38 are capable of a combined function of milling and clamping. It is now to be understood that it is possible to use this effectively once using tips, each of which by turning the inside out and the top can be used down a total of four times.

In the embodiment illustrated in FIGS. 3 to 5 According to the invention, both the tip body 36 and the lower tip 38 are formed in one body to accommodate the To keep the tooth root height line the same. However, both will have a central flat portion of a reasonable length (not shown) installed together.

The inFig. The fixing arrangement 29 shown in FIGS. 6 and 7 is used for the precise attachment of the plurality of insert tips 27 in the axial direction, is formed in approximately the same sketch as the insert tips 27, and has a number of support incisions 28, which in their upper side in the same pitch as the axial pitch of

- 15 209828/0557

each support part 23 of the cutter body 2o are provided.

Each of these support cuts 28 should be determined so as to correspond to the shape of the lower part of the tip 27.

Thus, when the lower part of the tip 27 is formed as a chucking side 37 in a shape indicated by that of the upper part of the tip body 36 is different, each insert tip 27 should be attached so as to be of to be reversible inwardly outwardly, by so forming the support cuts 28 that they are in their shapes correspond to the clamping side 37. However, when the clamping side 37 is turned to the bottom tip 38, which is shaped like the tip body 36 (see Figures 3 to 5), each support incision is intended to be 28 be designed so as to correspond in its shape to these lower peaks 38 and the tip body 36.

This makes it possible to the tip 27 by alternately engaging each support incision 28 and the lower tip 38 to be arranged reversibly with one another from top to bottom and inside to outside. Both sides 28 L, 28 R are at an angle of inclination - «to incline, equally the two sides 46, 47 of the lower tip 38 in the upright position.

- 16 -

209828/0557

Further, each fixing assembly 29 is circumferentially spaced apart by engagement with each straight flute 22 of the milling cutter body 2o and the tip support incision 28 of each one on the circumference adjacent fixing arrangement is each arranged in a helical direction with a lag of (l / number of straight chip flutes 22) times (inclination of the tip support part 23), these being formed so as to be able to be to take its correct position on the bottom of the tooth of each tip support member 23.

As shown in Figs. 1 and 2, each fixing assembly 29 is attached to each straight flute 22 that each Support incision 28 corresponds exactly to each support part 23, and each insert tip 27, the lower part of which on the engages respective support incision 28 is free by means of the adjusting wedge 31 and the clamping screw 32 removably attached, in such a way that the insert tip 27 is slightly advanced in one of the support part 23 Position can be securely fastened.

In the typical embodiment of the attachment for the fixing assemblies shown in Figs. 1 and 2 are each of these fixing assemblies 29 using a binder attached to it at each straight flute

- 17 -

20Ö823 / 05 & 7

22 of the milling cutter body 2o, but it can be considered to use these fixing arrangements 29 by means of a pair of clamping rings 61, 62 and a number of clamping screws 63 to mechanically fasten, such as shown in Figs.

The improved fixing arrangement 64 shown in FIGS. 9 to 11 has bevels 65, 66 which 'Both end faces are formed on the top and a number of these fixing arrangements 64 are on once by pressing the bevels 67 formed on the inside of the circumference of the clamping rings 61, 62, fastened against the bevels 65,66.

In this case, circular, worked-on lugs 69, 7o are formed on both end faces of the milling cutter body 2o, on which the clamping rings 61, 62 are each placed, the clamping in this case by means of a number of Clamping screws 63 takes place.

The adjusting wedge 31 for tensioning the insert tips 27 engages the wedge receptacle 24, which is on the milling cutter body 2o is provided and the insert tip is tightened by means of a clamping screw 32 such that the tip against the seat 26 of the milling cutter body 2o is pressed by the bevel 3o formed on its rear side. In the in Fig. 1 and

- 18 2098 2 8/0557

- ιε -

illustrated embodiment is any tip 27 each fastened by means of the adjusting wedge 31, but it is, if desired, possible to have two insert tips 27 to be fastened once by forming the adjusting wedge 31 in a larger width, as shown in FIG.

The improved adjusting wedge 71 illustrated in FIG. 8 is formed in a width that is twice the width of the teeth. With the use of the improved adjusting wedge 71 it is possible to have two insert tips 27 in a precise position fasten at once by pulling the back inside

72 of the wedge holder 24 of the cutter body 2o or

the corresponding rear side 73 of the adjusting wedge 71 are formed in a curved surface and the arches 72,

73 align and guide yourself.

As a result, when milling teeth with small pitches using small pitches, it does the simultaneous attachment of the two tips 27 by a single wedge 71 possible, through the reduced Number of pieces to be used and their simplified attachment to increase work performance, and at the same time It is possible, through the precise function of the adjusting wedge 71 on each insert tip 27, to achieve a high degree of milling work Precision and the tip 27 is not caused to be curved in position, whereby

- 19 -

209828/0557

prevents workpieces in curved tooth shape be milled, as a result of which high-precision milling work is carried out satisfactorily.

Further, when each insert tip 27 is individually received by its supporting part 23, its attachment often becomes very difficult It becomes cumbersome, especially in the case of a small pitch, to attach and remove the tips more difficult because the tips themselves have to be made smaller accordingly.

According to an improved embodiment of the present Invention, so-called composite tips 79 are provided by a number of individual tips 74, 75, 76, 77 each Support part 23 corresponds, and can also be accommodated in a body, which they via connecting parts 78 connects to each other (see Figs. 12 to 14).

In FIGS. 12 to 14, each of the individual tips 74, 75, 76 is designed with a flat profile shape of the theoretical tooth shape with a negative cutting angle R , equal to the tip body 36 shown in FIGS 180 ° turned and received in the lower part of the tooth of the upright individual point 74 and 75, a so-called composite point 79 is thus formed by connecting these

- 2o 2098 2 8/0557

- 2ο -

Individual tips with each other by means of connecting parts

78 in the same division as the division of the support parts 23 of the milling cutter body 2o.

While the sides 8o, 81 and 82, 83 of the individual peaks 74, 75 are inclined in this case by the pitch angle + cL , the sides 84, 85 and 86, 87 of the inverted individual peaks 76, 77 are inclined by the pitch angle. This makes it possible to use a composite tip

79, which is able to be turned from top to bottom and inside out.

Even in the case of milling teeth with smaller ones Tooth pitch it became possible by using the composite tips 79 to increase the work performance, namely with With the help of mass production of the easily and simplified manufactured tips and by the quick installation and removing the tips.

Furthermore, when attaching the composite tips 79, if desired, it is possible, similar to the attachment of the method shown in FIG. tips 27 shown to fasten two composite tips 79 (= 4 χ as many as individual tips) at once by means of the in adjusting wedges 71 configured to have a greater width.

- 21 -

2 U 98/8/0557

From the above description it can be clearly seen that the milling cutter according to the present invention has a high economic effect achieved by repeated use of the cutter body, made possible by merely changing its tip or tips alone if necessary and disclosing the invention also clearly their efficiency, which sufficiently compensates their construction costs, even when their peaks are off expensive materials are made, such as metal carbides, because these tips are in increasing numbers of operations can be used, and this due to the fact that if one of its cutting edges is worn or damaged, a new cutting edge is easily put into operation simply by changing the Attachment position of the point in question.

Claims

- 22 -

2 (J Ji « 7 I) / () b B 7

Claims (1)

Claims IJ milling cutter, which has a milling cutter body which has a Contains number of straight chip flutes, which on its circumference parallel to its axis at fixed intervals in the circumferential direction are arranged, characterized by a number of Stutζteile (23), of hob tooth shape, which are arranged in the axial direction at fixed intervals behind each of the straight chip flutes (22), Fixation assemblies (29) attached to each straight flute (22) and tip support cuts (28) have, which correspond to each of the support members (23), flat-shaped tips (27) each having a clamping side (37) on the underside of the tooth in order to engage in the support incision (28), and adjusting wedges (31) and clamping screws (32) for securing the tips so that they are freely removable, the milling cutter being able to to carry out gear milling work with its cutting edges (49 to 6o) formed in the removable tips. 2. Milling cutter, which has a cutter body which contains a number of straight chip flutes on its - 23 - - 33 - The circumference is arranged parallel to its axis at fixed intervals in the circumferential direction, marked by a number of point support parts (23), of hob tooth shape, which extend in the axial direction are arranged at fixed intervals behind each straight flute (22), fixing arrangements (29) attached to each straight flute are attached and have point support incisions (28) which correspond to each support part (23), flat-shaped tips (27), each of which has a clamping side (37) on the underside of the tooth, in order to be inserted into the Engage support incision (28), and adjusting wedges (31) and clamping screws (32) for securing the tips (27) so that they are freely removable, the cutter being able to have its formed in the removable tips To perform cutting edge gear milling work, the tip body (36) of the router has two flat surfaces has, which are parallel and plate-shaped, upper end faces (43, 48) which are vertical to the flat surfaces are, and two sides., parallel to the slope of the Hob tooth are inclined, the clamping side (37) at the bottom of the tooth of the tip body as a The lower tip (38) is formed of the same shape as the tip body, both the tip body and the Bottom point are included in one, whereby the latter is turned by 18o, effective cutting edges (49 to 6o) - 23 - 2UÜ8Z0 / 0S5 7 are designed to be at a negative slope angle on all the sides inside and outside and on both sides of the Tip body and each sub-tip to be picked up, thereby making tips that can be used only once that are able to be freely reversed from top to bottom and inside out. 3t milling cutter, which has a milling cutter body which contains a number of straight flutes which are located on its Perimeter parallel to its axis at fixed intervals in the circumferential direction, characterized by a number of point support share of hob tooth shape that is in the axial direction at fixed intervals behind each the straight chip flutes is arranged, fixxer assemblies which are attached to each of the straight chip flutes, and tip support cuts corresponding to each of the tip support members, flat-shaped tips, each having a snap-in side on the underside of the tooth to engage the tip support incision, and adjusting wedges and clamping screws for securing the tips to be freely detachable, the milling cutter in the Is able to perform gear milling work with its cutting edges formed in the removable tips, the tip body - 25 - 2Ü9828 / 0557 of the cutter has two flat surfaces that are parallel and plate-shaped, and upper end faces that are vertical to the flat faces and have double sides that are parallel with the helix angle of the hob tooth are inclined, the clamping side arranged on the underside of the tooth of the tip body as a lower tip the same shape as the tip body is formed, both the tip body and the lower tip are accommodated in one, the latter being turned by 180 °, effective cutting edges are formed, to be recorded at a negative angle of incline, on all sides inside and outside and on both sides of each Tip body and each sub-tip, in order to obtain single-use tips that are able to to be freely reversible from top to bottom and inside to outside, and a number of these can be used once only Tips are connected to one, thereby to obtain a single-use composite tip (79). 4. Milling cutter which has a cutter body which contains a number of straight chip flutes on its circumference are arranged parallel to its axis at fixed intervals in the circumferential direction, marked by a number of point support parts of rolling - 26 20U828 / 0557 cutter tooth shape that is fixed in the axial direction Distances behind each of the straight chip flutes are arranged, fixing arrangements attached to each of the straight Chip flutes are attached and have tip support cuts corresponding to each of the tip support members, flat shaped tips each having a gripping side on the underside of the tooth for attachment to the tip support incision attack and adjusting wedges and clamping screws for securing the tips to be freely removable, wherein the cutter is capable of gear milling with its cutting edges formed in the removable tips execute, each locking arrangement of the milling cutter is designed as a band plate, and a number of tip support incisions are provided in the respective upper part of the same, which are attached to the lower part of the tip and the lace support part that is behind each one straight flute is attached, in which the corresponding fixing arrangement is inserted, a fastening device for the fixation assembly is able to fix all of the fixation assemblies at once that is obtained by equipping both sides of the milling cutter with a pair of clamping rings (61, 62), the bevels (65, 66) have on their inner circumference, which correspond to the bevels (67, 68) on the fixing arrangements, after Form tapered surfaces on both end portions of each - 27 - 2ÜUÜ23 / 055 7 2Ί59336 Fixation assembly (64) and deploying each fixation assembly in the respective straight flutes. it Blank page